Centrifugal pump.



F. W. KROGH. CENTRIFUGAL PUMP. APPLICATION FILED AUG|3| 1915-` 92?'43, Patented Sept. 3, 1918.,

2 SHEETS*SHEET l INVENTOR ATTORNEY.

MI N w F. W. KROGH. CENTRIFUGAL PUMP. APPLICATION FILED AuG.3o. I9I5.

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Patented Sept. 3, 1918.

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INVENTOR WITNESSES ATTORN EY.

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CENTRIFUG-AL PUMP.

Specication of Letters Patent.

Patented Sept.. 3, 1918..

Application ned august 3o, 1915. serial no. 47,980.

To all lwhom t may concern:

Beit known that I, FERDINAND W. KROGH, of San Francisco, California, have invented certain new and useful Improvements in Centrifugal Pumps, whereof the following is a specification.

This invention relates to centrifugal pumps, and more particularly to' means for packing the pump shaft, and its object is chiefly to provide simple and effective means p for packing the pump shaft lat points of diiiicult accessibility. Other objects of the invention will appear hereinafter.

The invention is more particularly applicable to gang pumps, and I will describe it as applied to such.

In carrying out the invention,fas applied to gang pumps, I proceed as follows I arrange two or more pumps in the well, and at least one pump near the top ofthe well, and I apply the balancing devices to the latter. I provide a tubular casing around the shaft, in the well, and within the discharge pipe, which casing is perforated at points between shaft bearings, so that the pressure of the water in the discharge p ipe is communicated 'to the packings at those points, and thus keeps them tight. The icasing also serves another function, to wit: to convey waste oil from the bearings to aq 'point of discharge, and prevent it from contaminating the pumped water.

In the accompanying two sheets of drawings I have illustrated the invention as applied to aA gang pump having two pumps in the well and one pump at the top of the well, the latter being of suiicient size to' contain balancing means for the entire system.

In they drawings Figure 1 is a central vertical section of the well and pump system therein.

Fig; 2 is`a similar section, on an enlarged scale, of a portion of the apparatus, showing two bearings and the perforations in the shaft casing. j

Figs. 3, 4 and 5 are similar sections showing portions of the apparatus at different stages of operation.

In these figures:- l 1 represents the well, shown in Fig. 1 only. 2 and 3 are pumps therein farranged in series .takin their suction throughthe "pipe 4 and disc arging through the pipe 5,

into the surface pump 6, which in its turn f vin the usual manner into the peripheral chamber 11. The casing also comprises a chamber 12, under the impeller which receives water under pressure from the discharge and thus supports'the weigh-t of the various moving parts. 13 is a chamber in the casing ab'ovethe impeller into which water may enter by leakage through the joints and from which it is thrown by the passages 14, shown in dotted lines when the impeller moves downward in the casing, thus creating more or less of a vacuum in the chamber 13, so that the impeller rises again in the casing. Thus the parts are balanced.

At the top of the casing 8 of the surface pump is an oil cup, 8a, surrounding the shaft and serving to receive a supply of oil for the latter. i

15 is the shaft common to all pumps. This shaft is provided with the usual bearings and their packings at 16 and 17 which are accessible points and also with other bearings 18 and 19 down in the well and therefore of difficult accessibility.i

20 is a casing surrounding the shaft 15, and extending from the lower pumps upward to the bearing 17. This casing is perforated as seen at 21, at a point between the bearings 18 and 19, ls that the packing is subjected to a pressure due tof the hydrostatic head in the discharge pipe. Thus the packing is compressed upon the `shaft to lform a tight bearing and prevent the oil from runmng down and leaking outthrough the various joints into the well and at the same time the packing above the perforation forms a filter to keep the water in the casing 20, clear` of sand.l 1

The bearings may be supplied with oil by means ofan oil feed pipe 22,`extending-down into the well and provided with branches as shown leading, to the bearings. The oil as it works through the bearings is received in the casing20I and works up'ward therein to the waste oil discharge 23. Thus the oil is prevented from contaminating the water in the well and in the discharge pipe, so that the pumps supplyv pure water.

- 24 is a cock or valve, shown in Fig. 1, upon the oil discharge 23, by which it may be choked to'determinethe pressure within the shaft casing 20.

Referring to Figs. 3, 4 and 5; Fig. 3 illustrates a stage just after the starting of the pumps when the discharge pipe is not yet full of water and the waste oil 25, shows just above the bearing 18. In the Fig. 4,

lo the pumpinghas advanced a little; the water is higher in the discharge pipe and theA wasteoilhas been 'pushed up by Water enter- .ing/ the shaft casing through the perforations 21. In Fig. 5, the apparatus isin full operation, the water fills the discharge vpipe and the waste oil 25, is at the Atop ofthe shaft casing. and flowing out through the discharge 23.

For the purpose of holding the packing downupon the bearing 19 and compressing it, I- provide a weight 26, which rests upon the packing. In the Figs. 3, l; and 5, the

' Wei ht is shown in different lpositions as it wor s downward in use.

lThe bearing 1,8, and any other intermediate bearings that may be used, is provided with a channel 27 to provide a free riseof Y the Waste oil and water in the casing .20.

' The surface pump is secured to fixed supports bythe flanges and bolts at 28, as shown Vin Fig. 1, applied to its casing. The lower' pump casings are hung to the discharge pipe .5, which hangs from the casing 8 of the surface pump, and constitutes the 'suction thereof.

Having thus described my invention, and an embodiment of it, in the full, clear and exact terms required by law, and knowing that it comprises novel, useful and valuable improvements in the art to which it pertains, I here state that I do not wish to be limited to the precise construction and ar? rangement of the several parts, as herein set forth, as the same may be variously modilied by a skilled mechanic without departing Vfrom the spirit of the invention.

at I claim and desire to secure by Letters Patent of the United States, is the following,` tol witz* i Ula'ms.

1. A pumping ap aratus, having bearings l y of diiiicult accessibi ity, a casing surrounding the pump shaft between said bearings adapted to receive wasted oil', provided with perforations, packing in said/casing forming a tight bearing to preventthereby the oil from leaking out into the well, and forming at the same time a iilter to keep the water entering said casing, through said perforations. clear of sand.

2. A pumping apparatus, provided with bearings of diflicult accessibility, an oil feed for said bearings, a casing surrounding the pump shaft adapted to receive the waste oil from said bearings and to discharge the same, packing in said casing and means to pump shaft, having pac fing therein, and' adapted to receive waste oil from said bearings, an outlet at the upper end of saidcas- .ing and perforations Aat its lowerend, whereby the hydrostatic'pressure in the discharge acts. through said packing and forces the waste oil tothe outlet.

5. A pumping apparatus, provided with bearings of diflicult accessibility, an oil feed for said bearings, a casing surrounding the pump 'shaft provided with perforations at its lower portion, a controllable discharge outlet at its'upper portion, said casing adapted to receive the waste oil from said bearings, the intermediate bearings being channeled to .permit the free passage of the water from said perforations to said convtrollable discharge outlet, carrying therewiththe waste oil and packing in said casing to prevent the oil from runningpdown and leaking out through the various joints of the casing.

In testimony Vthat I claim the foregoing I have heretoset my hand this 25th day of August, 1915, in the`v presence of'witnesses.

FERDINAND WfKROGH. Witnesses: y

L. A` ALvns, R. M. WOLFE. 

